Computer Programming C Laboratory: Pointers C Programs

Write a C program to swap (interchange) the value of variables (Using Pointer and call by reference Function)

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call by reference - Using Pointers and Functions - C Programming

Write a C program to swap (interchange) the value of variables.

/* C Program to swap the value of variables using call by reference */

#include <stdio.h>

main()

{

int a=10, b=20;

printf ("\n Before swap a=%d,b=%d", swap(a,b));

void swap(&a,&b); /* swap is a function call with parameters */

printf ("\n After calling swap function a= %d,b=%d",a,b);

} /* main */

void swap(x,y)

int *x, *y; /* *x, *y is a pointer variables */

{

x=x+y;

y=x‒y;

x=x‒y;

printf ("\n In swap function x=%d,y=%d", *x, *y);

} /* swap */

OUTPUT

Before swap a=10, b=20.

In swap function x=20, y=10.

After calling swap function a=20, y=10.

EXPLANATION: Function called with address of variables a and b. The address of a,b are referred as x,y. The variables x and y is declared as pointer variables. The values of x and y are swapped without third variable and print the pointer variable x and y. The main program prints the value of a and b after called the swap() function.

Computer Programming C Laboratory: Pointers C Programs : Tag: C Programming : - Write a C program to swap (interchange) the value of variables (Using Pointer and call by reference Function)

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Computer Programming C Laboratory: Pointers C Programs

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